www.pudn.com > CSA.rar > specify_parameters.m, change:2016-10-17,size:5554b


% specify_parameters.m 
% 
% Run this program first to set up parameters for each data run.  The run 
% parameters are stored in the file "CD_run_params.mat" in the current 
% directory.  The program "extract_data.m" reads this file and adds some 
% fixed radar parameters to the file.  Subsequent programs can read this 
% file to obtain the parameters needed for the SAR processing. 
% 
% The radar data are stored on the CD supplied with the book, but they  
% can be read from a disk file copied from the CD to your hard drive. 
% 
% The only file needed from the CD is "dat_01.001", which contains the 
% radar data as well as the chirp replica and auxiliary data for each range 
% line.  As none of the parameters like PRF and range gate delay change in 
% this data set, and the replica is well defined by a linear FM chirp, the 
% only data that are really needed from the CD is the raw radar signal data 
% contained in "dat_01.001".  The radar parameters are stored in the 
% program "extract_data.m". 
% 
% The radar data can be written in one block, or broken up into a number of 
% blocks, with a set of files for each block. 
% 
% The first range cell and the number of range cells can be set to any 
% value within the boundaries of the data array.  The first range line 
% should be set to 1 plus a multiple of 8, and the number of lines per 
% block set to a factor of 8.  Also, the number of lines should be set to a 
% multiple of the number of lines per block.  If these rules are not 
% obeyed, the "extract_data.m" program will quantize the values accordingly. 
 
% Parameters to specify for each run: 
% ----------------------------------- 
% input_path    : location of the radar data file 'dat_01.001'  
% output_path   : location for the extracted data files 
% output_prefix : prefix to the extracted data file names 
% 
% first_rg_cell : first range cell to extract 
% Nrg_cells     : number of range cells to extract 
% first_rg_line : first range line (azimuth sample) to extract 
% Nrg_lines     : number of range lines to extract 
% Nrg_lines_blk : number of range lines per block 
% UseMATfiles   : Set to 0 if you want binary header, data, aux and replica  
%                 files (.DAT) rather than just the MATLAB data files (.MAT) 
% ------------------------------------------------------------------------- 
% Created :   Nov 29, 2004 by Kaan Ersahin  
% Modified:   Nov 30, 2004 by Kaan Ersahin 
% Modified:   Dec 3,  2004 by Ian Cumming  
%             - moved fixed parameters to "extract_data.m" 
%             - now use a fixed parameter file name for all programs 
%             - added UseMATfiles option (=1 for MAT files) 
% ------------------------------------------------------------------------- 
 
clear,   home,   format compact 
 
% Define location of data files 
% input_path      = 'Y:\RSAT\scene01\'; % These values are for runs at UBC 
% output_path     = 'Y:\RSAT\EXTRACTED_DATA\'; 
input_path        = '.\scene01\'; 
output_path       = '.\scene01\'; 
CD_data_file_name = 'dat_01.001'; 
output_prefix     = 'raw'; 
 
%========================================================================== 
%  Define area of interest of the radar data to be extracted 
%  Note that the azimuth parameters are quantized in "extract_data.m" 
% 
%  Here are some possible values for first_rg_cell and first_rg_line: 
%  For coal & ferry terminals, use range =  970, azimuth =  1801 
%  For Vancouver airport,      use range = 1060, azimuth =  5561 
%  For UBC and one ship,       use range =  760, azimuth =  7097 
%  For Stanley Park & city,    use range = 1850, azimuth =  7657 
%  For English Bay ships,      use range = 1050, azimuth =  7769 
%  For Squamish & Garibaldi,   use range = 2640, azimuth = 16169 
%  For Brackendale,            use range = 2800, azimuth = 17897 (max az) 
 
%                              use range = 1350, azimuth =  3170 
 
first_rg_cell   =  1050;    % Define the range limits 
first_rg_line   =  7769;    % Define the azimuth limits  (19432 max) 
Nrg_cells       =  2048;    % Suggest 2048 cells 
Nrg_lines_blk   =  6*256;   % Suggest 1536, it should be larger than the 
                            %        size of the azimuth match filter (705)  
                            %              so that an image can be created.                     
Nrg_lines   =  1*Nrg_lines_blk; 
 
UseMATfiles =  1; % (1) Use   MAT  files to save the extracted data 
                  % (0) Use binary files to save the extracted data 
SaveV6      =  0; % (1) Save data in MATLAB v6 format when using v7 
                  % (0) Save data in MATLAB v7 format 
                  % This variable is only used if you are running MATLAB 7 
%========================================================================== 
 
%  Save the data and run parameters in a matlab data file (*.mat) 
 
vv = version;   vers = str2num(vv(1));  % Find MATLAB version 
if vers == 6,   SaveV6 = 0;   end 
 
if SaveV6 
  save -v6 CD_run_params 
  fprintf('\nData parameters written to:  CD_run_params.mat  in V6 format') 
else 
  save CD_run_params 
  fprintf('\nData parameters written to:  CD_run_params.mat') 
end 
 
fprintf('\nNow run "extract_data.m"\n\n') 
beep,   pause(0.4),   beep 
 
%% This setup program is now finished, but you can add calls to subsequent  
%%  data extraction and processing programs below, if desired. 
 
% extract_data           % Extract the SAR data from the CD 
 
% compute_azim_spectra   % Find the baseband Doppler centroid 
 
% compress_data          % Perform SAR processing